\begin{tikzpicture}
	\tkzDefPoints{0/0/A, 4/0/B, 0/1/C, 3/-1/D, 2/0/O}
	\tkzDrawSegments(A,B  C,O  O,D)

	\tkzMarkAngle[size=0.5](C,O,A)  \tkzLabelAngle[pos=0.8](C,O,A){$1$}
	\tkzMarkAngle[size=0.5](D,O,B)  \tkzLabelAngle[pos=0.8](D,O,B){$2$}

	\tkzLabelPoints[below](A, B, D)
	\tkzLabelPoints[left](C)
	\tkzLabelPoints[above](O)
\end{tikzpicture}

